HT instruments PVCHECK - Manual (Page 29)

PVCHECK
EN - 27
6.2. MEASURING PARAMETERS ON PV PLANT WITHOUT USING SOLAR-02
The “PV installation efficiency” test carried out without using the optional remote unit
SOLAR-02 only allows evaluating output electrical parameters of a string or a photovoltaic
field (quantities, Vdc, Idc and Pdc), which can be periodically recorded with a
programmable integration period (see § 5.2.1). In this mode, the values of Irradiation, Te,
Tc, the nDC efficiency value are not evaluated and no result is provided by the instrument.
CAUTION
 The maximum voltage between inputs P and N is 1000VDC. Do not
measure voltages exceeding the limits given in this manual. Exceeding
these limits could result in electrical shocks to the user and damage to the
instrument.
 In order to guarantee the operator’s safety, while making the connections,
disable the system being measured by means of the switches/breakers
upstream and downstream of the DC/AC converter (inverter).
Fig. 5: Instrument connection for measuring PV installation parameters without SOLAR-02
1. Select the option “NO” as regards the type of remote unit to be used during EFF test
(see § 5.1.4), set the full scale of the DC clamp (see § 5.2.1), a possible correction
factor of the DC clamp (see § 0), the integration period and the rated power of the
system (see § 5.2.1 and § 5.2.2).
2. In order to guarantee the operator’s safety, disable the system being measured by
means of the switches/breakers upstream and downstream of the DC/AC converter
(inverter)
3. Connect the inputs P and N respectively to the positive and negative output of the
string, respecting the colours indicated in Fig. 5
4. Connect the output connector of the DC clamp to the IDC input.
CAUTION
BEFORE CONNECTING THE DC CLAMP TO THE CONDUCTORS
Switch on the clamp, check the LED indicating the status of the clamp’s
internal batteries (if present), select the correct range, press the ZERO key
on the DC clamp and check on the display of PVCHECK the actual zeroing
of the corresponding Idc value (values up to 0.02A are acceptable).